Here is the full list of all 19 Divine Knockout (DKO) achievements.
Achieve 'Double KOs Silver'
Achieve 'Resilient'
Achieve 'Victorious Gold'
Achieve 'Rebound'
Achieve 'Triple KOs Silver'
Achieve 'Triple KOs Gold'
Achieve 'Double KOs Gold'
Achieve 'Victorious Silver'
Achieve 'Destructive'
Achieve 'Traveler’s Tall Tale'
Achieve 'The Penta-Ultimate'
Achieve 'Divine Knock Out!'
Achieve 'KO Collection Silver'
Achieve 'KO Collection Gold'
Achieve 'Damage Dealer Silver'
Achieve 'Damage Dealer Gold'
Achieve 'Air-Time'
Achieve 'PvE'd'
Achieve 'Practice Makes Perfect'